1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3 2; RUN: opt -S -passes=jump-threading < %s | FileCheck %s 3; RUN: opt -S -passes=jump-threading -jump-threading-across-loop-headers < %s | FileCheck %s --check-prefix=THREAD-LOOP 4 5; FIXME: This is a miscompile if -jump-threading-across-loop-headers is enabled. 6define i64 @test(i64 %v) { 7; CHECK-LABEL: define i64 @test( 8; CHECK-SAME: i64 [[V:%.*]]) { 9; CHECK-NEXT: entry: 10; CHECK-NEXT: [[V_NONNEG:%.*]] = icmp sgt i64 [[V]], -1 11; CHECK-NEXT: br label [[FOR_BODY:%.*]] 12; CHECK: for.body: 13; CHECK-NEXT: [[SUM:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[SUM_NEXT:%.*]], [[FOR_BODY]] ] 14; CHECK-NEXT: [[SUM_NEXT]] = add i64 [[SUM]], [[V]] 15; CHECK-NEXT: [[OVERFLOW:%.*]] = icmp ult i64 [[SUM_NEXT]], [[SUM]] 16; CHECK-NEXT: [[CMP:%.*]] = xor i1 [[V_NONNEG]], [[OVERFLOW]] 17; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[EXIT:%.*]] 18; CHECK: exit: 19; CHECK-NEXT: ret i64 [[SUM]] 20; 21; THREAD-LOOP-LABEL: define i64 @test( 22; THREAD-LOOP-SAME: i64 [[V:%.*]]) { 23; THREAD-LOOP-NEXT: entry: 24; THREAD-LOOP-NEXT: [[V_NONNEG:%.*]] = icmp sgt i64 [[V]], -1 25; THREAD-LOOP-NEXT: br label [[FOR_BODY:%.*]] 26; THREAD-LOOP: for.body: 27; THREAD-LOOP-NEXT: [[SUM:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[SUM_NEXT:%.*]], [[FOR_BODY]] ] 28; THREAD-LOOP-NEXT: [[SUM_NEXT]] = add i64 [[SUM]], [[V]] 29; THREAD-LOOP-NEXT: [[OVERFLOW:%.*]] = icmp ult i64 [[SUM_NEXT]], [[SUM]] 30; THREAD-LOOP-NEXT: br i1 [[V_NONNEG]], label [[FOR_BODY]], label [[EXIT:%.*]] 31; THREAD-LOOP: exit: 32; THREAD-LOOP-NEXT: ret i64 [[SUM]] 33; 34entry: 35 %v.nonneg = icmp sgt i64 %v, -1 36 br label %for.body 37 38for.body: 39 %sum = phi i64 [ 0, %entry ], [ %sum.next, %for.body ] 40 %sum.next = add i64 %sum, %v 41 %overflow = icmp ult i64 %sum.next, %sum 42 %cmp = xor i1 %v.nonneg, %overflow 43 br i1 %cmp, label %for.body, label %exit 44 45exit: 46 ret i64 %sum 47} 48